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New Powerwall in Romania
#11
Yes, those canadian i also remember. When i saw them i was expecting a lot from them... very wrong!
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#12
in order to destroy you opus take some TP4056 to charge first (are very cheap) ..... i use 6 of theme and let the cells to stay some 10-15 days and then test only cells with more then 4v

PS: you are not alone ..... salutari !
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#13
I already have 10 TPs, using them to make the initial charge on everything except the Sanyos (there is some sort of temp protection on Opus, I think is good to have it with Sanyo). The interesting fact is that LG behaved well before the leak so.. probably bad luck.

Good to know DIY is not dead in Romania, really glad to see you here.
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#14
did you manage to buy your inverter?
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#15
Nope, will wait until i have all the cells. i don't want it's warranty to pass while sitting in the box
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#16
I managed to talk to my retailer and told me that at the end of April it gets new stock ......if this help you
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#17
Actually it might help, because i have just got today another 50 or so packs, so i will get closer to my target of 560 for stage one Big Grin 
Please keep me posted.
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#18
So, long time since my last update. 

I reconsidered some specs for my powerwall. I upsized the packs from 40p to 60p, the busbars will be made from 2x2.5mm twisted copper (the 6mm AC copper pipe is overkill). Probably tonight i will finish the first 2-3 packs. 

Pictures will follow soon.

LE

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#19
After a hiatus of over one year, I restart working on the powerwall. The inverter arrived, not the one I originally had in mind, but a PIP2424MSE1. It found it quite cheap ebay, delivered from inside EU, sot it arrived in an amazing four day interval. 

 

I already have built 9 60p packs, so as soon as the spring arrives, i will pick 7, install the panels and start the initial testing.

I have two questions
1. The panels - I have in mind some 280W panels, but i am unsure about this max 80V MPPT - 105V max PV input. Sould I go with 2 panels in series or 3 (38,85V open circuit, 31,814 Vmp).
2. BMS - i want to use the Batrium, in the first months i'd rather not spend 500-600 eur on it. The packs are matched quite well, buit in 2018, harged, let to rest. After one year, the voltages are in .07 V range of each other. Is advisable to use them without Batrium this summer?
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#20
(01-17-2020, 07:12 AM)cat23 Wrote: I have two questions
1. The panels - I have in mind some 280W panels, but i am unsure about this max 80V MPPT - 105V max PV input. Sould I go with 2 panels in series or 3 (38,85V open circuit, 31,814 Vmp).
2. BMS - i want to use the Batrium, in the first months i'd rather not spend 500-600 eur on it. The packs are matched quite well, buit in 2018, harged, let to rest. After one year, the voltages are in .07 V range of each other. Is advisable to use them without Batrium this summer?

Welcome back

1) What are the other stats on the panels?
2) That's really nice to only have that small of a drift. At least you know you don't have any self dischargers. I would still recommend a BMS of some sort, even if a cheap one. But at least monitor voltages on a daily basis. Perhaps use those led volt meters on each pack to make that easier.
It's one thing for them to not drift while resting and back/forth current flow. It's another to start moving current around. You're making them work now so they may drift a little more.
Proceed with caution. Knowledge is Power! Literally! Cool 
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